Blower Shroud Spoke Structure for Airflow and Water Management
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Solution Overview
Problem
Conventional blower devices experience reduced air delivery rates due to the drive source mounting part obstructing airflow, leading to increased water accumulation around the drive source, which can be exacerbated by higher wind speeds.
Innovation Solution
The blower device incorporates a drive source mounting part with an inner cylinder and outer cylinder connected by spokes, allowing airflow between them and featuring a top wall with an edge positioned closer to the positive pressure side to direct water away from the drive source, along with a stretch part on the inner cylinder to receive splashing water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the drive source mounting part is arranged in the fan installation hole to surround the drive source, then the drive source is protected from water, but the air delivery of the fan is blocked
Solution Approach 1:
The drive source mounting part is divided into an inner cylinder and an outer cylinder with multiple spokes connecting them, creating segmented air passage regions between the cylinders that allow air to flow while still surrounding and protecting the drive source
Solution Approach 2:
Air passages are created in the radial dimension between the inner and outer cylinders, allowing air to flow around the drive source in a different spatial dimension rather than directly through the mounting part, thus protecting the drive source while maintaining air delivery
2Productivity
If the drive source mounting part is made smaller to reduce air delivery blockage, then air delivery rate improves, but water accumulation around the drive source increases
Solution Approach 1:
The mounting part is segmented into inner and outer cylinders with radial spokes, creating a protective structure that extends outward without blocking the axial air flow path, thus maintaining air delivery while providing water protection
Solution Approach 2:
The radial arrangement of multiple spokes creates periodic openings in the mounting part that allow air to pass through at intervals, maintaining air delivery while the overall structure provides continuous water protection
3Object-affected harmful factors
If the top wall of the inner cylinder is extended toward the positive pressure side to direct water away, then water covering is reduced, but air delivery may be affected
Solution Approach 1:
The top wall of the inner cylinder is extended only at the positive pressure side where water protection is needed, while the rest of the structure maintains open air passages, providing localized water direction without affecting overall air delivery
Solution Approach 2:
Instead of blocking water from reaching the drive source, the extended top wall actively directs water away using the airflow direction, converting the harmful water flow into a controlled path that moves away from the drive source
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances air delivery rates by preventing airflow blockage and reduces water accumulation on the drive source by directing airflow and water effectively.
Implementation Method 1
due to the air flowing from the negative pressure side toward the positive pressure side
Data Source
AI summary
A blower device includes a motor having an output shaft and a housing; a fan rotationally driven by the motor; and a shroud having a shroud body with a fan installation hole, and a motor mounting part for mounting the motor arranged inside the fan installation hole when viewed in an axial direction of the output shaft. The motor mounting part includes an inner cylinder surrounding a periphery of the motor from a radial outer side of the output shaft; an outer cylinder surrounding the inner cylinder from the radial outer side; and spokes connecting the inner and the outer cylinders. The inner cylinder includes a top wall covering the motor from above while the shroud is fixed. A back end edge of the top wall, which is located on a positive pressure side when the fan is rotated, is located closer to the positive pressure side than the housing.